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A199610 Decimal expansion of greatest x satisfying x^2+3*x*cos(x)=3*sin(x). 3

%I #5 Mar 30 2012 18:57:58

%S 3,0,6,5,6,2,0,7,6,0,3,3,6,8,5,8,5,6,1,8,6,7,4,5,7,5,5,2,8,5,0,8,2,1,

%T 3,2,5,0,6,5,4,0,2,0,6,8,2,0,1,7,0,6,2,6,3,9,9,4,5,6,9,0,5,4,3,3,1,2,

%U 5,4,8,2,7,3,8,3,4,7,4,3,0,4,4,5,7,0,8,1,7,8,0,0,8,7,6,1,4,1,1

%N Decimal expansion of greatest x satisfying x^2+3*x*cos(x)=3*sin(x).

%C See A199597 for a guide to related sequences. The Mathematica program includes a graph.

%e least: 1.14225640224474011004461587823586435251534483...

%e greatest: 3.0656207603368585618674575528508213250654...

%t a = 1; b = 3; c = 3;

%t f[x_] := a*x^2 + b*x*Cos[x]; g[x_] := c*Sin[x]

%t Plot[{f[x], g[x]}, {x, -1, 4}, {AxesOrigin -> {0, 0}}]

%t r = x /. FindRoot[f[x] == g[x], {x, 1.1, 1.2}, WorkingPrecision -> 110]

%t RealDigits[r] (* A199609, least of 3 roots *)

%t r = x /. FindRoot[f[x] == g[x], {x, 3, 3.1}, WorkingPrecision -> 110]

%t RealDigits[r] (* A199610, greatest of 3 roots *)

%Y Cf. A199597.

%K nonn,cons

%O 1,1

%A _Clark Kimberling_, Nov 08 2011

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Last modified April 19 16:52 EDT 2024. Contains 371794 sequences. (Running on oeis4.)